Biological control of root-eating pests in Iranian agriculture
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Biological Control Agents for Root-Eating Pests in Iranian Agriculture
Root-Knot Nematodes: Major Root-Eating Pests in Iran
Root-knot nematodes (Meloidogyne spp.) are among the most damaging root-eating pests in Iranian agriculture, causing significant yield losses in vegetables and other crops. Traditional chemical nematicides, while effective, pose environmental and health risks, leading to increased interest in biological control methods as safer alternatives Khan2022Azlay2022Khan2023+1 MORE.
Fungal and Bacterial Biocontrol Agents: Key Strategies
Biological control strategies focus on using living organisms such as fungi and bacteria to suppress root-eating pests. Fungi like Trichoderma, Pochonia, Paecilomyces, Arthrobotrys, and Acremonium have shown the ability to reduce nematode populations and crop damage, with some studies reporting up to 45% reduction in nematode damage compared to untreated conditions Peiris2020Azlay2022Khan2023+1 MORE. These fungi use mechanisms such as trapping nematodes, producing enzymes, and inducing plant resistance to control pest populations Khan2022Peiris2020Khan2023+1 MORE.
Bacterial agents, particularly species of Pseudomonas and Bacillus, are also effective. They suppress nematodes and root-feeding insects by producing antibiotics, hydrolytic enzymes, and by inducing systemic resistance in plants. These bacteria can also promote plant growth and help protect against a range of soil-borne pathogens Alizadeh2020Kupferschmied2013.
Commercial Biocontrol Products and Legal Framework in Iran
In Iran, several biocontrol products are registered or pending registration, including those based on Bacillus thuringiensis for insect pests and Trichoderma harzianum for soilborne diseases. The Iranian Plant Protection Organization oversees the regulation and registration of these products, supporting the adoption of microbial biopesticides in agriculture Alizadeh2020Karimi2018. Trichoderma, Pseudomonas, and Bacillus are the most commonly used biocontrol agents in Iranian research and practice, with proven effectiveness in both laboratory and field conditions Alizadeh2020Karimi2018.
Integrated Approaches and Synergistic Effects
Combining different biocontrol agents, such as fungi and bacteria, can enhance pest suppression and plant protection. These integrated approaches may also include the use of organic amendments like botanical extracts and oil cakes, which release natural compounds that inhibit nematode movement and survival Khan2022Azlay2022Khan2023+1 MORE. Synergistic effects between biocontrol agents and induced plant defenses can further optimize root pest control .
Challenges and Future Directions
While biological control offers promising results, challenges remain in achieving consistent high-level pest suppression, especially under varying field conditions. More research is needed to understand the interactions between biocontrol agents, soil properties, and crop management practices. Continued development and registration of effective biopesticides, along with farmer education and support, are essential for wider adoption in Iran Peiris2020Kergunteuil2016Karimi2018.
Conclusion
Biological control of root-eating pests in Iranian agriculture relies on a combination of fungal and bacterial agents, supported by organic amendments and integrated pest management strategies. These eco-friendly approaches are increasingly important for sustainable crop production, reducing reliance on chemical pesticides, and protecting both the environment and human health Khan2022Peiris2020Azlay2022+4 MORE.
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